From Fenway to Camden Yards to Marlins Park, baseball is defined by the built environment. We've already surveyed the big picture. Now it's time to explore the depths. We're looking for photos and stories to build an online guide to the restrooms of Major League Baseball—the Yelp of plop, you might say—starting with Wrigley Field. Send yours to tips@deadspin.com, subject "Designated Shitters."